How do we know that HE made it though? Like someone mentioned above, the goblins may have had to use some sort of craft to ferry themselves across the lake at some point. Maybe Gollum didn't build it, but came upon it and took it?
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In Doriath let him reign, and be glad that he has the sons of Finwe for his neighbours, not the Orcs of Morgoth that we found.
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